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JPS56125195

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DESCRIPTION JPS56125195
1 Beno specification 1, title of the invention
Electro-acoustic transducer
3. Detailed Description of the Invention The present invention relates to an electroacoustic
transducer, in which a vibration absorber is added to a vibration system to suppress disturbance
of sound pressure frequency characteristics. FIG. 1 shows a conventional cone-shaped dynamic
speaker, wherein 1 is a diaphragm, 2 is an edge, 3 is a plate, 4 is a magnet, 5 is a voice coil, 6 is a
center ball, 7 is a damper, and 8 is a frame. , Page 2 29 is a voice coil bobbin, and 1 o is a dust
cap. The sound pressure frequency characteristics when such a speaker is housed in a closed
type speaker box are as shown in FIG. 2, and low and high frequency resonances are respectively
around the lowest resonance frequency f0 and high frequencies 11 and above. It is well known
that the sound pressure frequency characteristics are disturbed. SUMMARY OF THE INVENTION
The present invention provides an electro-acoustic transducer which can suppress the
disturbance of the sound pressure frequency characteristic and obtain a flat sound pressure
frequency characteristic by adding a simple vibration absorber. An embodiment of the present
invention will be described below with reference to FIGS. 3 and 4. In FIG. 3, parts and minutes
with the same reference numerals as in FIG. 1 have the same functions. Reference numeral 11
denotes a spring-like object such as a coil spring attached to the center of the dust cap 10, and at
the lower end thereof, an object 12 having a texture is spared. These objects 11, 121't operate as
vibration absorbers that suppress the vibration of the speaker. EndPage: 13?7-7 и Fig. 4 shows
an equivalent circuit when the speaker of Fig. 3 is housed in a closed cabinet. In FIG. 4, F is the
driving force, M is the mass of the vibration system of the speaker, C1 is the compliance of the
vibration system support, R1 is the mechanical resistance of the vibration system, C3 is the
compliance of the closed cabinet, M3. C4... Are distributed constants representing the high
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frequency resonance shown in FIG. And the compliance of the object 11 with elasticity is 02, the
mass of the object 12 with mass is represented by M2, which are connected in parallel with one
another, the element M4. It is connected in series to C1 and R1. (1) represents the speed of the
diaphragm 1 of the speaker. Therefore, it is possible to suppress the low frequency resonance of
the resonance frequency 2 shown in FIG. 2 determined by the compliance C2 of the object 11
and the mass M2 of the object 12. Further, if it is adjusted to a predetermined resonance
frequency above the resonance frequency fkf1, the high frequency at that frequency Resonance
can be suppressed. In the above embodiment, the vibration absorber is provided on the inside of
the dirt cap, but if ? is provided near the point where the force of the voice coil 6 acts on the
diaphragm 1, the same effect can be obtained. Further, the same effect can be obtained by
providing it on the voice coil bobbin 9.
In any case, it is needless to say that it is necessary to consider that the vibration system does not
shift by adding a vibration absorber. It goes without saying that the present invention is applied
not only to a speaker but also to a microphone etc. can get. As described above, according to the
present invention, it is possible to simply suppress the disturbance of the sound pressure
frequency characteristic simply by adding the vibration absorber i to the vibration system and
adjusting the resonance frequency of the vibration absorber to the resonance point of the
vibration system.
4. Brief description of the drawings. FIG. 1 is a cross-sectional view of a conventional example,
FIG. 2 is a sound pressure frequency characteristic diagram when it is housed in a closed cabinet,
FIG. 3 and FIG. It is sectional drawing of an Example, and its equivalent circuit schematic. 1 и и и и и и
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и и и и и и и и и и и и и и и и и и и и и и и и и и spring An object having a mass of 12. Name of agent Attorney-inlaw Baron kit и 1 force и 1 person Figure 1? f ? 2QEndPage: ?
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